Speaker
Description
In this work, we present the new multi-wavelength dataset of aerosol profiles, which are retrieved from the averaged transmittance spectra by the Global Ozone Monitoring by Occultation of Stars instruments on board the Envisat satellite.
Using monthly and zonally averaged transmittances as a starting point for the retrievals allows an improved signal-to-noise ratio of elimination of possible modulation of transmittance spectra by the incorrected scintillations. The two-step retrieval method is used: the spectral inversion is followed by the vertical inversion. The spectral inversion relies on removal on contribution from ozone, NO2, NO3 and Raileigh scattering from the optical depth spectra, for each ray perigee altitude. In the vertical inversion, the profiles of aerosol extinction coefficients at several wavelengths are retrieved from the collection of horizontally integrated aerosol extinction profiles.
The new aerosols extinction profiles (FMI-GOMOSaero dataset v.1) are provided in the altitude range 10-40 km at wavelengths 400, 440, 452, 470, 500, 525, 550, 672 and 750 nm, for the whole GOMOS operating period from August 2002 to March 2012.
The retrieved aerosol extinction profiles show realistic wavelength dependence. Validation has shown that FMI-GOMOSaero aerosol profiles are in good agreement with other datasets, and it has a better quality (i.e., wavelength-dependence, agreement with other datasets, enhancements during volcanic eruptions) compared to the previous GOMOS aerosol data.
